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@GF
Actually, I've found a useful thread here:
http://www.bikeforums.net/showthread.php/779686-Inflation-pressure-for-wider-%2823mm%29-rims
This seems to suggest that on a rim like the A23, a 23mm tyre measures 25mm and so you should use 25mm in the calculator I reposted above.
(I make that 70 front, 110 rear, - think I'll go a bit higher on the front, 80 perhaps)
(Also, thanks for the mergatron - hadn't seen this thread before)